CN110076190B - Remediation method for heavy metal contaminated soil - Google Patents
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- CN110076190B CN110076190B CN201910383544.3A CN201910383544A CN110076190B CN 110076190 B CN110076190 B CN 110076190B CN 201910383544 A CN201910383544 A CN 201910383544A CN 110076190 B CN110076190 B CN 110076190B
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Abstract
The invention provides a method for restoring heavy metal contaminated soil, which adopts acrylamide, acrylic acid, N' -methylene bisacrylamide, ammonium persulfate and SiO2Preparing polyacrylamide mesoporous material by using colloidal crystal template, and preparing quaternization by using corn straw fiber powderAnd (2) uniformly mixing the porous fiber adsorbent with urea and calcium superphosphate to obtain a composite repairing agent, uniformly paving a composite repairing agent layer at a position of 600mm away from the surface layer of the soil to be repaired, irrigating the soil on the upper layer of the composite repairing agent, and taking out the composite repairing agent layer after 30 days to finish the repair of the heavy metal contaminated soil. The method for restoring the heavy metal contaminated soil is simple to operate, can obviously reduce the content of the effective heavy metal in the soil and the content of the heavy metal in the wheat body, and has a very wide application prospect.
Description
Technical Field
The invention belongs to the technical field of polluted soil treatment, and particularly relates to a method for restoring heavy metal polluted soil.
Background
In recent years, with the aggravation of industrial production, urban life pollution and chemical pollution, the problem of heavy metal pollution of soil is more and more serious. Heavy metals in soil have poor mobility, long retention time and great treatment and recovery difficulty, can not be chemically or biologically degraded, easily enter human bodies through food chain approaches such as water sources, plants and other media, and finally affect human health. Heavy metal pollution of soil not only causes serious harm to the yield and quality of crops, animal and human health, but also influences the whole environmental quality. The source of soil pollution and the remediation technology are also the hot spots and difficulties of domestic and foreign research. Soil is one of the main natural resources on which human beings rely to live, is also an important component of the ecological environment of human beings, and is in urgent need of treatment whether the soil is polluted or polluted. Therefore, it is necessary to develop a heavy metal soil remediation method with high efficiency, good treatment effect and simple operation.
At present, the restoration of heavy metal polluted soil mainly comprises the technical methods of abandoned land, removed soil, nursery stock planting, chemical regulation, microbial restoration and the like, but the methods have longer period, higher investment cost and poorer operability. Chinese patent 201810463664.X discloses a biological and fertigation combined remediation method for medium and light cadmium contaminated soil, which comprises the steps of selecting a silage corn variety, sowing and harvesting, sowing a winter wheat variety, ploughing after harvesting, and carrying out rotary tillage during the ploughing period. The method has low investment cost and overlong period. Chinese patent 201710717542.4 discloses a cadmium-contaminated soil remediation agent, which is prepared by uniformly mixing citric acid, humic acid and fly ash.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a method for repairing heavy metal contaminated soil.
The method for repairing the heavy metal contaminated soil comprises the following steps:
step one, uniformly mixing acrylamide, acrylic acid, N' -methylene bisacrylamide and ammonium persulfate to obtain solution A, and mixing SiO2Adding the colloidal crystal template into a glass reaction bottle, vacuumizing for 1-2h, and adding the solution A to ensure that the solution A is submerged in SiO2Standing a colloidal crystal template for 2-4h, removing the solution in the reactor when the template is transparent, introducing nitrogen for 20-40min, then transferring into a heat preservation box for heat preservation reaction, taking out the compound after the reaction is finished, placing the compound in 32-38wt% hydrofluoric acid solution for ultrasonic oscillation for 30-50h, then placing the compound in clear water for washing until the compound is neutral, and performing vacuum drying to obtain the polyacrylamide mesoporous material;
adding corn straw fiber powder into a chloroform solution, performing ultrasonic oscillation cleaning for 1-2 hours, cleaning for 3 times by using clear water, drying for 20-24 hours at 70-90 ℃, soaking the dried corn straw fiber powder in a sodium hydroxide solution at room temperature for ultrasonic cleaning for 1-3 hours with a material-liquid ratio of 1:10(g/mL), performing ultraviolet irradiation, filtering to remove redundant solution, drying at 65-85 ℃, mixing with epichlorohydrin and ethylenediamine, stirring at a high speed for 1 hour in a constant-temperature water bath at 98 ℃, adding diethylenetriamine for reaction for 1 hour, adding triethylamine for stirring again for reaction for 3 hours, soaking and washing the obtained product for 5 times by using distilled water, and drying to obtain a quaternized porous fiber adsorbent;
and step three, uniformly mixing the polyacrylamide mesoporous material, the quaternized porous fiber adsorbent, the urea and the calcium superphosphate to obtain a composite repairing agent, uniformly paving a composite repairing agent layer at the position of 600mm away from the surface layer of the soil to be repaired, irrigating the soil on the upper layer of the composite repairing agent once every 10 days, and taking out the composite repairing agent layer after 30 days.
Preferably, the molar ratio of the acrylamide, the acrylic acid, the N, N' -methylene-bisacrylamide and the ammonium persulfate in the step one is 1 (4-8): 0.1-0.2: 0.011-0.017.
Preferably, the heat preservation reaction step in the step one is to react for 3 to 6 hours at 40 to 60 ℃, and then heat the reaction product to 70 to 90 ℃ for 18 to 22 hours.
Preferably, the temperature of vacuum drying in the step one is 50-70 ℃ and the time is 20-26 h.
Preferably, the concentration of the sodium hydroxide solution in the second step is 30wt% to 42 wt%.
Preferably, the time of ultraviolet irradiation in the second step is 2-8 h.
Preferably, the thickness of the composite repairing agent layer in the third step is 20-30 mm.
Preferably, the irrigation standard in the third step is 40-50m3Per mu.
The method for repairing the heavy metal contaminated soil has the following action mechanism:
the polyacrylamide mesoporous material is prepared by utilizing acrylamide, acrylic acid monomers and a SiO2 colloidal crystal template, has adjustable pore diameter, uniform pore diameter distribution and larger specific surface area and pore volume, not only has higher adsorption capacity for heavy metal ions, but also can be repeatedly utilized;
the quaternary amination porous fiber adsorbent prepared by the invention adopts corn straw fiber widely existing in nature as a raw material, is low in cost, renewable and biodegradable, is prepared by pretreating the corn straw fiber to form more apertures in the fiber and improve the adsorption capacity of the fiber, and is grafted and modified to prepare the quaternary amination porous fiber adsorbent which has strong adsorption capacity on heavy ions in soil.
The method for restoring the heavy metal contaminated soil has the following beneficial effects:
the method for restoring the heavy metal contaminated soil provided by the invention is simple to operate, can obviously reduce the content of the heavy metal in the soil in an effective state, has the passivation rate of more than 90% and can reach 98.14% at most, and can inhibit the migration of the heavy metal into wheat plants and obviously reduce the content of the heavy metal in the wheat plants.
Detailed Description
The present invention will be described in more detail with reference to examples.
Example 1
The method comprises the following steps: uniformly mixing acrylamide, acrylic acid, N' -methylene bisacrylamide and ammonium persulfate according to the molar ratio of 1:4:0.2:0.011 to obtain a solution A, and mixing SiO2Adding the colloidal crystal template into a glass reaction bottle, vacuumizing for 1.5h, and then adding the solution A to ensure that the solution A is submerged in SiO2Standing a colloidal crystal template for 3h, removing the solution in the reactor when the template is transparent, introducing nitrogen for 30min, then transferring the template into an incubator for carrying out heat preservation reaction for 3h at 60 ℃, then heating to 90 ℃ for carrying out heat preservation reaction for 18h, after the reaction is finished, taking out the compound, placing the compound in 38wt% hydrofluoric acid solution for carrying out ultrasonic oscillation for 30h, then placing the compound in clear water for washing to neutrality, and carrying out vacuum drying for 20h at 50 ℃ to obtain the polyacrylamide mesoporous material;
step two: adding corn straw fiber powder into a chloroform solution, carrying out ultrasonic oscillation cleaning for 2 hours, wherein the material-liquid ratio is 1:20 (g/mL), cleaning for 3 times by using clear water, drying for 24 hours at 70 ℃, soaking the dried corn straw fiber powder in a triethylamine aqueous solution, carrying out ultrasonic cleaning for 1 hour, wherein the material-liquid ratio is 1:10(g/mL), then carrying out ultraviolet irradiation for 8 hours, filtering to remove redundant solution after irradiation, drying at 65 ℃, mixing the dried fiber with epoxy chloropropane and ethylenediamine according to the weight ratio of 1:5:6, stirring for 2 hours at a high speed in a constant-temperature water bath at 90 ℃, then adding diethylenetriamine with the weight of 2 times of the fiber for reaction for 1.5 hours, finally adding triethylamine with the weight of 5 times of the fiber for stirring and reacting for 4 hours, soaking and washing the obtained product for 5 times by using distilled water, and drying at 90 ℃ to obtain a quaternized porous fiber adsorbent;
step three: uniformly mixing 58 parts of polyacrylamide mesoporous material, 28 parts of quaternary amination porous fiber adsorbent, 8 parts of urea and 1 part of calcium superphosphate according to a weight ratio to obtain a composite repairing agent, uniformly paving a composite repairing agent layer with the thickness of 20mm at a position 600mm on the surface layer of soil to be repaired, and then uniformly paving 40m of upper-layer soil of the composite repairing agent layer3Irrigating once every 10 days according to the standard of per mu, and taking out the composite repairing agent layer after 30 days.
Example 2
The method comprises the following steps: uniformly mixing acrylamide, acrylic acid, N' -methylene bisacrylamide and ammonium persulfate according to the molar ratio of 1:8:0.1: 0.017) to obtain a solution A, and mixing SiO2Adding the colloidal crystal template into a glass reaction bottle, vacuumizing for 1.5h, and then adding the solution A to ensure that the solution A is submerged in SiO2Standing a colloidal crystal template for 3h, removing the solution in the reactor when the template is transparent, introducing nitrogen for 30min, then transferring the template into a heat preservation box for heat preservation reaction at 40 ℃ for 6h, then heating to 70 ℃ for heat preservation reaction for 22h, taking out the compound after the reaction is finished, placing the compound in 32wt% hydrofluoric acid solution for ultrasonic oscillation for 50h, then placing the compound in clear water for washing to neutrality, and performing vacuum drying at 55 ℃ for 22h to obtain the polyacrylamide mesoporous material;
step two: adding corn straw fiber powder into a chloroform solution, carrying out ultrasonic oscillation cleaning for 1h with the material-liquid ratio of 1:20 (g/mL), cleaning for 3 times with clear water, drying for 20h at 90 ℃, soaking the dried corn straw fiber powder in a triethylamine aqueous solution, carrying out ultrasonic cleaning for 3h at room temperature with the material-liquid ratio of 1:10(g/mL), then carrying out ultraviolet irradiation for 2h, filtering after irradiation to remove redundant solution, drying at 85 ℃, mixing the dried fiber with epichlorohydrin and ethylenediamine according to the weight ratio of 1:5:6, stirring at high speed for 2h in a constant-temperature water bath at 90 ℃, then adding diethylenetriamine with the weight 2 times of the fiber for reaction for 1.5h, finally adding triethylamine with the weight 5 times of the fiber for stirring again for reaction for 4h, soaking and washing the obtained product for 5 times with distilled water, and drying at 90 ℃ to obtain a quaternized porous fiber adsorbent;
step three: uniformly mixing 42 parts of polyacrylamide mesoporous material, 34 parts of quaternary amination porous fiber adsorbent, 2 parts of urea and 3 parts of calcium superphosphate according to a weight ratio to obtain a composite repairing agent, uniformly paving a composite repairing agent layer with the thickness of 30mm at a position of 400mm on the surface layer of soil to be repaired, and then uniformly paving 50m of upper-layer soil of the composite repairing agent layer3Irrigating once every 10 days according to the standard of per mu, and taking out the composite repairing agent layer after 30 days.
Example 3
The method comprises the following steps: uniformly mixing acrylamide, acrylic acid, N' -methylene bisacrylamide and ammonium persulfate according to the molar ratio of 1:5:0.18:0.016 to obtain solution A, and mixing SiO2Adding colloidal crystal template into glassVacuumizing the reaction flask for 1.5h, and then adding the solution A to ensure that the solution A is soaked in SiO2Standing a colloidal crystal template for 3h, removing the solution in the reactor when the template is transparent, introducing nitrogen for 30min, then transferring the template into a heat preservation box for heat preservation reaction at 55 ℃ for 3.5h, then heating to 85 ℃ for heat preservation reaction for 19h, taking out the compound after the reaction is finished, placing the compound in 37wt% hydrofluoric acid solution for ultrasonic oscillation for 35h, then placing the compound in clear water for washing to be neutral, and performing vacuum drying at 60 ℃ for 24h to obtain the polyacrylamide mesoporous material;
step two: adding corn straw fiber powder into a chloroform solution, carrying out ultrasonic oscillation cleaning for 1.8h, wherein the material-liquid ratio is 1:20 (g/mL), cleaning for 3 times by using clear water, drying for 23h at 75 ℃, soaking the dried corn straw fiber powder in a triethylamine aqueous solution, carrying out ultrasonic treatment for 1.5h at room temperature, wherein the material-liquid ratio is 1:10(g/mL), then carrying out ultraviolet irradiation for 6h, filtering to remove redundant solution after irradiation, drying at 70 ℃, mixing the dried fiber with epoxy chloropropane and ethylenediamine according to the weight ratio of 1:5:6, stirring at a high speed for 2h in a constant-temperature water bath at 90 ℃, then adding diethylenetriamine with the weight of 2 times of the fiber for reaction for 1.5h, finally adding triethylamine with the weight of 5 times of the fiber for further stirring for reaction for 4h, soaking and washing the obtained product for 5 times by using distilled water, and drying at 90 ℃ to obtain a quaternized porous fiber adsorbent;
step three: uniformly mixing 54 parts of polyacrylamide mesoporous material, 30 parts of quaternary amination porous fiber adsorbent, 6 parts of urea and 1.5 parts of calcium superphosphate according to a weight ratio to obtain a composite repairing agent, uniformly paving a composite repairing agent layer with the thickness of 22mm at 550mm of the surface layer of soil to be repaired, and then uniformly paving 45m of upper-layer soil of the composite repairing agent layer3Irrigating once every 10 days according to the standard of per mu, and taking out the composite repairing agent layer after 30 days.
Example 4
The method comprises the following steps: uniformly mixing acrylamide, acrylic acid, N' -methylene bisacrylamide and ammonium persulfate according to the molar ratio of 1:6:0.12:0.013 to obtain solution A, and mixing SiO2Adding the colloidal crystal template into a glass reaction bottle, vacuumizing for 1.5h, and then adding the solution A to ensure that the solution A is submerged in SiO2Standing for 3h, removing the solution in the reactor when the template is transparent, introducing nitrogen for 30min, and coolingThen transferring the mixture into an incubator at 45 ℃ for heat preservation reaction for 5.5h, heating to 75 ℃ for heat preservation reaction for 21h, taking out the compound after the reaction is finished, placing the compound in 33wt% hydrofluoric acid solution for ultrasonic oscillation for 45h, then placing the compound in clear water for washing to be neutral, and drying in vacuum at 70 ℃ for 16h to obtain the polyacrylamide mesoporous material;
step two: adding corn straw fiber powder into a chloroform solution, carrying out ultrasonic oscillation cleaning for 1.2h, wherein the material-liquid ratio is 1:20 (g/mL), cleaning for 3 times by using clear water, drying for 21h at 85 ℃, soaking the dried corn straw fiber powder in a triethylamine aqueous solution, carrying out ultrasonic treatment for 2.5h at room temperature, wherein the material-liquid ratio is 1:10(g/mL), then carrying out ultraviolet irradiation for 4h, filtering to remove redundant solution after irradiation, drying at 80 ℃, mixing the dried fiber with epoxy chloropropane and ethylenediamine according to the weight ratio of 1:5:6, stirring at a high speed for 2h in a constant-temperature water bath at 90 ℃, then adding diethylenetriamine with the weight of 2 times of the fiber for reaction for 1.5h, finally adding triethylamine with the weight of 5 times of the fiber for further stirring for reaction for 4h, soaking and washing the obtained product for 5 times by using distilled water, and drying at 90 ℃ to obtain a quaternized porous fiber adsorbent;
step three: uniformly mixing 46 parts of polyacrylamide mesoporous material, 32 parts of quaternary amination porous fiber adsorbent, 4 parts of urea and 2.5 parts of calcium superphosphate according to a weight ratio to obtain a composite repairing agent, uniformly paving a composite repairing agent layer with the thickness of 28mm at 450mm of the surface layer of soil to be repaired, and then uniformly paving 45m of upper-layer soil of the composite repairing agent layer3Irrigating once every 10 days according to the standard of per mu, and taking out the composite repairing agent layer after 30 days.
Example 5
The method comprises the following steps: uniformly mixing acrylamide, acrylic acid, N' -methylene bisacrylamide and ammonium persulfate according to the molar ratio of 1:6:0.15:0.014 to obtain a solution A, and mixing SiO2Adding the colloidal crystal template into a glass reaction bottle, vacuumizing for 1.5h, and then adding the solution A to ensure that the solution A is submerged in SiO2Standing for 3h, removing the solution in the reactor when the template is transparent, introducing nitrogen for 30min, transferring into a heat preservation box at 50 ℃ for heat preservation reaction for 4h, heating to 80 ℃ for heat preservation reaction for 20h, taking out the compound, placing the compound in 35wt% hydrofluoric acid solution for ultrasonic oscillation for 40h after the reaction is finished, and placing the compound in clear water for washing to the middleDrying at 65 ℃ for 24 hours in vacuum to obtain the polyacrylamide mesoporous material;
step two: adding corn straw fiber powder into a chloroform solution, carrying out ultrasonic oscillation cleaning for 1.6h, wherein the material-liquid ratio is 1:20 (g/mL), cleaning for 3 times by using clear water, drying for 22h at 80 ℃, soaking the dried corn straw fiber powder in a triethylamine aqueous solution, carrying out ultrasonic treatment for 2h at room temperature, wherein the material-liquid ratio is 1:10(g/mL), then carrying out ultraviolet irradiation for 5h, filtering to remove redundant solution after irradiation, drying at 75 ℃, mixing the dried fiber with epichlorohydrin and ethylenediamine according to the weight ratio of 1:5:6, stirring for 2h in a constant-temperature water bath at 90 ℃, then adding diethylenetriamine with the weight 2 times of the fiber for reaction for 1.5h, finally adding triethylamine with the weight 5 times of the fiber for further stirring for reaction for 4h, soaking and washing the obtained product for 5 times by using distilled water, and drying at 90 ℃ to obtain a quaternized porous fiber adsorbent;
step three: uniformly mixing 50 parts of polyacrylamide mesoporous material, 31 parts of quaternary amination porous fiber adsorbent, 5 parts of urea and 2 parts of calcium superphosphate according to a weight ratio to obtain a composite repairing agent, uniformly paving a composite repairing agent layer with the thickness of 25mm on the 500mm position of the surface layer of soil to be repaired, and then uniformly paving 45m above the upper layer of soil of the composite repairing agent layer3Irrigating once every 10 days according to the standard of per mu, and taking out the composite repairing agent layer after 30 days.
Test 1: the method comprises the following steps of testing the content of Cd in an effective state in soil by taking unrepaired soil as a blank control, wherein the test results are shown in Table 1:
TABLE 1
| Effective concentration (ppm) of Cd in soil | Passivation Rate (%) | Concentration of pb effective state (ppm) in soil | Passivation Rate (%) | Effective state concentration (ppm) of Cu in soil | Passivation Rate (%) | |
| Blank control | 0.5873 | 2.7354 | 3.5354 | |||
| Example 1 | 0.0581 | 92% | 0.4834 | 84% | 0.5211 | 85% |
| Example 2 | 0.0454 | 93% | 0.3932 | 87% | 0.4359 | 88% |
| Example 3 | 0.0371 | 95% | 0.3002 | 90% | 0.3287 | 91% |
| Example 4 | 0.0211 | 97% | 0.1346 | 95% | 0.2152 | 94% |
| Example 5 | 0.0128 | 98% | 0.0952 | 97% | 0.1003 | 97% |
Test 2
Preparing soil into 300mg/kg cadmium-polluted soil, 500mg/kg lead-polluted soil and 550mg/kg copper-polluted soil, respectively placing the soil into plastic pots with the size of 11 multiplied by 13cm, wherein each pot is filled with 400g of soil, repairing the soil by using the composite repairing agent prepared by the invention, planting wheat seeds in the soil after repairing, sowing 25 seeds in each pot, culturing in an incubator in a dark place for 12 hours after 12 hours of illumination, setting the temperature to be 25 ℃, the humidity to be 64%, watering for 1 time every 20 hours, collecting a wheat plant sample after 20 days, and measuring the content of heavy metals in the wheat plant, wherein the results are shown in table 2:
TABLE 2
| Cadmium content in wheat (mg/kg) | Lead content in wheat (mg/kg) | Copper content in wheat (mg/kg) | |
| Unrepaired soil | 22.57 | 28.52 | 34.33 |
| Example 1 | 10.63 | 12.88 | 13.65 |
| Example 2 | 9.78 | 12.13 | 12.77 |
| Example 3 | 9.52 | 11.25 | 11.85 |
| Example 4 | 8.46 | 10.41 | 11.23 |
| Example 5 | 8.11 | 9.32 | 10.54 |
As can be seen from the test results in tables 1 and 2, the remediation method for the heavy metal contaminated soil provided by the invention can obviously reduce the content of the heavy metal in the soil in an effective state, and the application of the composite soil remediation agent can obviously reduce the content of the heavy metal in the wheat body.
Although the present invention has been described in detail in the examples by way of general illustration, specific embodiments and experiments, it is to be understood that modifications and improvements may be made without departing from the spirit of the invention and within the scope of the following claims.
Claims (8)
1. The method for restoring the heavy metal contaminated soil is characterized by comprising the following steps:
step one, uniformly mixing acrylamide, acrylic acid, N' -methylene bisacrylamide and ammonium persulfate to obtain solution A, and mixing SiO2Adding the colloidal crystal template into a glass reaction bottle, vacuumizing for 1-2h, and adding the solution A to ensure that the solution A is submerged in SiO2Standing a colloidal crystal template for 2-4h, removing the solution in the reactor when the template is transparent, introducing nitrogen for 20-40min, then transferring into a heat preservation box for heat preservation reaction, taking out the compound after the reaction is finished, placing the compound in 32-38wt% hydrofluoric acid solution for ultrasonic oscillation for 30-50h, then placing the compound in clear water for washing until the compound is neutral, and performing vacuum drying to obtain the polyacrylamide mesoporous material;
adding corn straw fiber powder into a chloroform solution, performing ultrasonic oscillation cleaning for 1-2 hours, cleaning for 3 times by using clear water, drying for 20-24 hours at 70-90 ℃, soaking the dried corn straw fiber powder in a sodium hydroxide solution at room temperature for ultrasonic cleaning for 1-3 hours with a material-liquid ratio of 1:10(g/mL), performing ultraviolet irradiation, filtering to remove redundant solution, drying at 65-85 ℃, mixing with epichlorohydrin and ethylenediamine, stirring at a high speed for 1 hour in a constant-temperature water bath at 98 ℃, adding diethylenetriamine for reaction for 1 hour, adding triethylamine for stirring again for reaction for 3 hours, soaking and washing the obtained product for 5 times by using distilled water, and drying to obtain a quaternized porous fiber adsorbent;
and step three, uniformly mixing the polyacrylamide mesoporous material, the quaternized porous fiber adsorbent, the urea and the calcium superphosphate to obtain a composite repairing agent, uniformly paving a composite repairing agent layer at a position of 600mm below the surface layer of the soil to be repaired, irrigating the soil on the upper layer of the composite repairing agent once every 10 days, and taking out the composite repairing agent layer after 30 days.
2. The method for remediating heavy metal contaminated soil as recited in claim 1, wherein the molar ratio of the acrylamide, the acrylic acid, the N, N' -methylenebisacrylamide, and the ammonium persulfate in the first step is 1 (4-8): 0.1-0.2): 0.011-0.017.
3. The method for remediating heavy metal contaminated soil as recited in claim 1, wherein in the first step, the heat preservation reaction step is a reaction at 40-60 ℃ for 3-6 hours, and then the temperature is raised to 70-90 ℃ for 18-22 hours.
4. The method for remediating heavy metal contaminated soil as recited in claim 1, wherein the temperature of the vacuum drying in the first step is 50-70 ℃ and the time is 20-26 hours.
5. The method for remediating heavy metal contaminated soil as recited in claim 1, wherein the concentration of the sodium hydroxide solution in the second step is 30wt% to 42 wt%.
6. The method for remediating heavy metal contaminated soil as recited in claim 1, wherein the ultraviolet irradiation time in the second step is 2-8 hours.
7. The method for remediating heavy metal contaminated soil as recited in claim 1, wherein the thickness of the composite remediation agent layer in the third step is 20-30 mm.
8. The method for remediating heavy metal contaminated soil as recited in claim 1, wherein the irrigation standard in step three is 40-50m3Per mu.
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